Thanks Michael and Andy; this makes perfect sense.
The builder didn't address the shore-power wiring specifically, but of course did mention the need to provide grommets wherever wires passed through bits of metal. I suppose it makes sense to take this seriously.
In a past lifetime I once drilled several thousand large holes through plaster and wire lathe inside a large building (for blown insulation) and found that the wire lathe was all live at 110v. I learned to be quite careful about not providing a path to ground through my own flesh. Somewhere in that building a single 110v wire bare of insulation was touching a piece of lathe; I'd hate to imagine the same thing happening in my incipient camper van, which is 1) all metal, and 2) loaded with ridiculously delicate electronic components.
Thanks again!
Mark
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